Device for molding propeller-wheels.



Patented lune 27,1899;-

F. BALDT.' DEVICE FUR MULDlNG PROPELLER WHEELS.

(Application med Feb. 1, 1899.)

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No. 627,794'. t Paten'fed lune 2.7, l89.

F. BALDT.

DEVICE FOR MULDING PROPELLER WHEELS.

(Application'led Feb. l. 1899.)

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l F. BALnT. DEVICE F08 HOLDING PBDPELLEH' WHEELS.

(Application led Feb. 1, 1899.)

(No Model.) 4 Sheets--Sheet 3.

No. 627,794. Patented lune 27, |899. F. BALDT.

DEVICE FOB MULDING PROPELLER WHEELS.

(Application filed Feb. 1, 1899.)

4 Sheets-Sheet 4.

(N0 Model.)

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UNITED STATES PATENT lilfEEIcE.

FREDERICK BALDT, OF CHESTER, PENNSYLVANIA.

DEVICE FOR MOLIDING PROPELLER-WHEELS.

SPECIFICATION forming part of Letters Patent No. 627,7' 94, dated June 27', 1899.

Application iiled February l, 1899. Serial No. 704,119, (No model.)

T all whom. it may concern.-

Be it known that I, FREDERICK BALDT, a citizen of the United States, residing at Chester, in the county of Delaware, State of Pennsylvania, have invented a new and useful Improvement in Devices for Molding Propeller- Wheels, which improvement is fully set forth in the following specification and accompanying drawings.

This invention consists of a device for molding propeller-wheels, and comprises an angle frame or pattern-support adapted for use in connection with a plurality of flasks,.so that after the pattern of a blade and a portion of the hub is secured in position within the frame corresponding molds may be made in a plurality of llasks, the number corresponding to the number of blades inthe propeller to be cast. For instance, in a four-bladed propeller the angle of the sides of the frame and the ends of the flask would be ninety degrees, and four of these flasks could be juxtaposed to form the mold for the complete propeller.

The object of the invention is to provide an angle frame and flask that are adapted for patterns of varyin g size or in which the pitch or contour of the blade varies, so that propellers of varying size and shape may be east in molds made thereby.

The inventionfurther consists in the details of construction hereinafter fully described and specifically claimed.

Figure l represents a top plan View of a molding device constructed in accordance with this invention. Fig. 2 represents a side elevation thereof. Fig. 3 represents a front end elevation. Fig. 3X represents a detailed sectiontaken on line a: m, Fig. 3. Fig. 4 represents a perspective View of a flask removed from the frame. Fig. 5 represents an end elevation thereof. Fig.' G represents a plan view of the drag or lower section of a flask. Fig. l7 represents a bottom plan View of the hub or upper section of the llask. Fig. 8 represents a perspective view of the frame with the flask removed, the view being taken from the rear side and with the pattern in place. Fig. 9 represents afragmentary top plan view of the pattern-support and'adjacent parts, partly in section. Fig. l0 represents a plan or fall of the drags in all sections of the molds assembled.

Similar letters and numerals of reference indicate corresponding parts in the igures.

In accordance with the principle of this invention I propose to construct a molding de vice that consists, essentially, of a frame having a pattern-support for holding the pattern of a blade and a portion of the hub so that a plurality of ilasks may b'e applied to have molds formed therein which canafterward be assembled. In the particular embodiment illustrated the device is shown as adapted for casting a four-bladed propeller-that is to say, the sides of the frame carrying the pattern-holder are at an angle of ninety degrees and the openend of the llask is adapted to lit and to be secured firmly against these angular sides of the frame. In thisway it is seen that the ends of the .mold of the flask being at this angle can be assembled, as shown in Fig. lO, to form the complete mold.

The device is also adapted for use in connecyalso avoids the necessity of changing or rebaring the flasks.

Referring to the drawings, A designates the frame, and B the flask. essentially, of a pattern support or plate l, the angular side pieces 2, and the bottom piece or base 3. In the construction illustrated the upright portion of the frameis sit.- uated transversely at one end of the bottom piece or base, as best shown in Figs. l and 2, and consists of the top and bottom crosspieces 4, the side pieces 2, and the pattern support or plate l, the latter being situated centrally between and supported by said cross-pieces 4. These parts are suitably connected and braced by the uprights 5 and horizontal braces 6, as found convenient. As shown in Figs. l and 8, the side' pieces 2 are situated at an angle of ninety degrees and meet against the rear face of the cross-pieces 4, while the pattern-support is situated centrally relative to the meeting ends of the side pieces. The said pattern support or plate l is mounted to swing between said cross-pieces 4 by means of pivots 6, Fig. 3X, carried by The frame consists,

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plates 7 at its upper and lower edges, said pivots being situated within vsockets or plates 8 upon the adjacent edges of the cross-pieces. Besides swinging on these pivots the said pattern-support l can be shifted laterally, owing to the connection between the plates S and the cross-pieces, the same consisting conveniently of slots 9 in the plates, through which pass bolts or other fastening devices 10. To hold the pattern-support 1 rigidly in its adj usted position, l preferably employ the pivoted screw-rods 11, mounted upon one of the nprights 5, whichj are adapted to enter the bifurcated ends of arms, and to hold the pattern-support rigidly in its adjusted position in an obvious'manner.

The pattern 14, (best shown in Figs. 1, 8, and 9,) is suitably secured to the inner face of the support or plate 1, its hub portion 15 projecting between the inner ends of the side pieces 2. Although in the drawings I have shown the side pieces as being adjustable or provided with shutters to meet the hub portion of the pattern and also to act in con j unction with the adjustable pattern-support to make a close joint around said hub portion when the mold is being formed, yet it is understood that in accordance with the principle of this invention said side pieces may have suitable openings therein, in which the hub portion 15 fits sufficiently close to allow the sand to be packed to form the mold and to allow said pattern to be removed with the flask, as described hereinafter. In the particularconstruction illustrated, however, said side pieces are provided with movable sections or shutters 16, Fig. 8, about the same height as the pattern-support. These shutters 16 slide longitudinally in suitable guides, and their inner ends, notched or cut away, as shown at 17, fit over the hub portion of the pattern when the mold is being formed. These sliding and movable shutters 16 not only serve to fit the semicircular hub portion of the pattern to form a close joint and to also allow said pattern to be withdrawn with the flaskthat is to say, by withdrawing the shutters, as shown in Fig. S-but alsopermit the shifting of the pattern-support and pattern, as above referred to. In connection with cer tain patterns it is necessary sometimes to turn the pattern-support on its pivot and to shift the same, and in this case the movable shutter or section of the side pieces conforms to the position of the hub portion of the pattern to make a close joint, as shown, or it may be necessary to build up or patch the inner ends of these shutters with strips or the like to make them conform to the shape of the hub.

The asks (best seen in Figs. 4, 5, 6, and 7) consist of the lower section or drag 18 and the upper section or cope 19,partin g obliquely, owing to the pitch of the plate, and having angular open ends to iit between the side pieces of the frame. The drag 18 has the bottom piece 2O provided with the right-angled end portion 21 to fit the side pieces and to hold the ask in the determined position, and the edges of the drag and cope are beveled at the same angle, as `shown at 22 and 23. The sides of the cope and drag are provided all along their meeting edges with flanges 24 and 25, by which the sections of the fiasks are held in position by means of pins 26. In Fig. 6 is shown a plan view of the drag, which consists of the bottom piece 2O and the end and side walls 27. Between the side walls are the bars or plates 28, having openings 29, while the end bar or plate 28 may be provided with longitudinal arms 30, which serve to sustain the sand at the open end of the flask. A bottom view of the cope is shown in Fig. 7, which consists of the end and side walls 3l and the bars or plates 32, having the openings 33 for the pattern, the combined shape and relative location of the openings of the flask being best shownin Figs. 4t and 5. The end plate 32 of the cope is provided with a plurality of arms 3l to sustain the sand in an obvious manner. The flask is conveniently held in position upon the base 3 of the frame, in close contact with the side pieces, by removable pins 35 entering openings 36 in the base-piece and engaging the outer end of the iiask, as best shown in Figs. 1 and 8.

The operation is as follows: The pattern 14 is first secured to the pattern-support in a removable manner, conveniently by the screws 37, and the hub portion thereof pro jects through the opening at the inner end of the side pieces and forms a close vjoint therewith, it being understood that the movable projection 16 may or may not be used. The drag is then placed in position, with its angular end 21 iitting between the side pieces and held in such position with pins 35. The pattern extends into the drag and assumes the position seen in dotted lines in Fig. 6. The sand is packed within the drag and around the pattern, being inclosed by the" side pieces 2 and the walls of the drag, while the parting is made from the upper edges of the sides and ends of the drag to the adjacent edges of the patternfor instance, as shown in dotted lines in said Fig. 6. After this portion of the mold is formed the cope is placed in position, as shown in Figs. 1, 2, 4, and 5, and the sand packed therein to form the upper section of the mold, it being inclosed by the side pieces of the frame and the walls of the cope. After the mold is thus formed the pattern is nnfastened from the pattern-support, so that it is free to move with the mold, and then the flask is moved outwardly a little distance upon the `base 3 to remove the inner end of the hub portion of the pattern from the opening in the side pieces. The cope is removed and trimmed, after which the pattern can be removed from the drag and the latter trimmed. The pattern can then be used again to form another mold, and after four such have been formed they are placed in the position shown in Fig. 10 (only IOO IIO

the drags being shown for convenience) and a complete propeller can be cast. j

The movable shutters or sections of the side pieces are useful even when the pattern-support is not shifted or adjustable, since it serves to make a close joint with the hub portion of the pattern at thecorrect angle, and in using this structure it is necessary,of course,to slide the shutters outwardly when the pattern is being inserted or when the pattern is to be removed With the mold.

The movable pattern support or plate is useful to adapt the device for use in connection with the patterns varying in size and shape. For instance, it may be desired to use a pattern in which the pitch of the plate will be such that it could not be passed through the openings in the iiask, and to shift the pattern to cause it to tit within said openings it can be turned on its pivots 6X, it being obvious that the nuts 13 are loosened to allow this movement. Upon reference to Fig. 9, however, it will be seen that the pattern shifts on the pivots 6 as a center, so that the true center of the pattern is shifted to one side of the center of the molding device. To retain the pattern in its shifted position and to bring it's center in line with the center of the molding device, the said pattern support or plate is moved laterally through the slotted connection of its sockets with the cross-pieces 4:. The sockets are then tightened and the pattern held in its adjustedposition by the fastening devices 1l and 13, as is obvious. The sections or shutters 16 and side pieces also come into use in this connection to cause the opening of the side pieces to conform to the position of the pattern-hub, the inner ends of said side pieces being built up or patched, if necessary. The pattern-support is held in its adjusted posit-ion until molds for the complete number of blades have been formed, it being noted that the pattern assumes the same relative position, and thus forms a regular and symmetrical mold.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of a frame having angularly-arranged upright side pieces meeting at their inner ends, an upright pattern-support situated adjacent to the junction of said side pieces, and a flask adapted to fit between said side pieces.

2. The combination of a frame having an upright pattern-support, angularly-arranged upright side .pieces extending toward and `meeting said pattern-support about midway between its ends, and a iiask.

3. The combination of Ia frame having an upright pattern-support, angularly-arranged, upright side pieces having their inner ends meeting adjacent to said support and proupright laterally-adjustable pattern-support adapted to swing, means for rigidly securing the same, and a ilask laterally situated relative thereto.

7. The combination of a frame having a pattern-support carried by upright pivots mounted in laterally adjustable sockets, means for rigidly securing the saine, and a ilask.

8. The combination of a frame having an upright pattern-support, adjustable, angularly-arranged, upright side pieces meeting said support at their inner ends, and a iiask laterally situated relative to said pattern-support. p

9. The combination of a frame having a pattern-support, side pieces having their inner ends notched or cut away between the upper and lower edges thereof to fit the top and bottom edges of the pattern, and a ask. l0. The combination of a frame having an upright pattern-support, angularly-arranged upright side pieces movable toward and away from said pattern-support and meeting at their inner ends adjacent to said support, and a lask laterally situated relative to said pattern-support. 11. The combination of a frame, having a pattern-support, angularly-arranged,upright side pieces movable longitudinallyT toward and away from said pattern-support and meeting at their inner ends adjacent to said support,.and a flask laterally situated relative to said pattern-support.

12. The combination of a frame having a pivoted and laterally-adj ustable pattern-support, means for holding the same rigid rela` tive to the said frame, and angularly-arran ged side pieces meeting midway between the sides of said pattern-support and provided with movable sections or shutters having their inner ends notched or out away to tit the pattern, and a flask.

. FREDERICK `BALDT. `Vll'itnesses': i SAML. LYoNs,

JOHN J. TIsDALE.

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